这是一个更新过程的问题。
After the latest Thunderbird update (version 102), I realized my Tbsync add-on was now incompatible. Tbsync has been updated to v4 to catch up to TB 102, but my current Tbsync version is 3.0.2 and Thunderbird can't find any updates available in the repositories.
So I wondered what the last Tbsync version was in the repositories and found this page which tells me that the available versions for Tbsync go from v2 for Ubuntu 20.04 to v3 for …